Akrapovic Slip-On Exhaust Slip-ons represent the first step in the exhaust system tuning process, and they offer a great balance between price and performance. Change the nature of your bike by adding more power, improved performance, and the unique Akrapovic sound. Everything packed in stylishly designed slip-on exhaust systems. The result of taking design very seriously is a beautifully crafted exhaust system with a titanium muffler outer sleeve. Race-proven materials.